You can do the same thing on the 2-disc DVD for Magnolia, no fake penis though.

I discovered two easter eggs on my special edition of Blue Velvet.

Egg #1: Go to the special features menu. Click the up arrow on your control past the documentary "Mysteries of Love". Now the word "special" in special features should be highlighted. Click it and watch a very short clip from an interview with David Lynch where he talks about food.

Egg #2: Click on the Mysteries of Love special feature and you'll be taken to a menu with all the chapters for this documentary. Click up on your remote to highlight the Mysteries of Love title, then click that to watch an unused clip from an interview for the documentary with Isabella Rossellini.